Sentences with phrase «past snowball earth»

Climate modelers go back in time to simulate past Snowball Earth conditions and find that complete freeze - over is hard to achieve.

Not exact matches

Jim Green: One of the things that we've uncovered is that, in Earth's past, [our planet has] gone through various stages, one of which we call Snowball Earth.

Bart Verheggen says: August 14, 2011 at 3:03 am So how do past climate changes (from snowball earth to the hothouse Cretaceous) fit in your paradigm that «that the temperature of the Earth is kept within a fairly narrow range through the action of a variety of natural homeostatic mechanisms.&raearth to the hothouse Cretaceous) fit in your paradigm that «that the temperature of the Earth is kept within a fairly narrow range through the action of a variety of natural homeostatic mechanisms.&raEarth is kept within a fairly narrow range through the action of a variety of natural homeostatic mechanisms.»?

Global warming began its recovery after the last Snowball Earth, was halted a few times by the ice ages (big and little), and for the past 150 or so years has been slowly been returning to NORMAL.

One perfect storm, say a deep solar minimum, Milankovitch cycle in the glacial phase, continents arranged as they are today, and a supervolcano eruption all at the same time would probably trigger another snowball earth episode which has happened a few times in the past few billion years.

And some seem to think in distance past of having Earth have 10,000 ppm CO2 and it being a snowball Earth - both could occur in same period of time.

Such a thing may have happened in the very distant past — there is inconclusive evidence for a «Snowball Earth» in which ice might have reached the equator, more than 700 million years ago, before complex life colonised the land or the seas.

Because of the increase in solar irradiance over the past 600 Myr and volcanic emissions, no feasible CO2 amount could take the Earth back to snowball conditions.

This is essential when using radionuclide production rates to infer past solar activity, which is of high interest to reveal the solar influence on Earth's climate variability (e.g., Marsh & Svensmark 2003; Solanki et al. 2004; Muscheler et al. 2005b; Usoskin et al. 2006; Snowball et al. 2007).

Younger Dryas: Nisbet (1990b); Nisbet (1992); far past (ending «snowball Earth» episodes): Kennedy et al. (2008).

Temperatures have ranged from snowball earth to the Cretaceous greenhouse, and so nothing that has happened in the recent past is outside the bounds of variability from past climates.

It is somewhat controversial but it is generally believe that earth has had a few snowball episodes in the past and the CO2 hypothesis above is the only reasonable explanation for how it ever manages to melt once the ice takes over.

Although climate throughout Earth's history has varied from «snowball» conditions with global ice cover to «hothouse» conditions when glaciers all but disappeared, the climate over the past 10,000 years has been remarkably stable and favorable to human civilization.